The tone is rather odd, SHD. You need to simplify and get to the point: Dear Manager, I have had an account at [bank name] for the l ast 10 years. I requested a user ID and password for net-banking on [date] followed by several reminders over the last months, but I have received no response at all.
New words, one handy idiom, and a 2-minute quiz — delivered to your inbox to keep your streak alive.